O2ptima CM Simulator

BUILDING DIVER…

Guided scenarios

Dive

Target depth10 m

Descent rate18 m/min

Ascent rate9 m/min

WorkloadVO₂ 1.1 L/min

Water temperature12 °C

Oxygen control · SOLO

Active setpointkey H

Low setpoint0.70 bar

High setpoint1.20 bar

Auto switch (up at 21 m · down at 12 m)

ADV shut-offkey A

Diluent MAV fitted (works with the ADV closed)

Diluent (off-board stage → ADV/MAV)

Simulation

Time warp00:00:00

O₂ cylinder valve closed Fault: solenoid stuck open Fault: SOLO 9 V battery dead (no solenoid) Fault: cells 1 & 2 read 30 % low Fault: cell 3C current-limited Fault: OBOE AA battery dead (HUD dark)

Scrubber media

Drag to orbit · scroll to zoom · click any part for details. Particles in X-ray: CO₂-laden, scrubbed, O₂ injected, diluent.

PPO₂ · Petrel 2 cells 1, 2, 3C (bar)

CELL 1

0.70

PASS

CELL 2

0.70

PASS

CELL 3C

0.70

PASS

HUD · cells 1, 2, 3H

Cell 3H (HUD)0.70

Setpoint0.70 L

Voted PPO₂0.70

Real loop PPO₂0.70

Depth10.0 m

Loop FO₂0.35

Dil PPO₂0.42

ADVOPEN

Loop volume (6 L total)5.5 L

Ideal loop volume– L

Solenoid · O₂ injection

SOLENOID

IDLE

Fires0 /min

Last pulse0.00 s

O₂ added (avg)0.00 L/m

Metabolic1.10 L/m

MAV flow0 L/m

Dil flow0 L/m

O₂ cylinder (AL13 2 L / 207 bar)207 bar

Diluent stage (S40 5.8 L)200 bar

Bailout stage (S80 11.1 L, own regulator)200 bar

Axial scrubber · ExtendAir cartridge

Remaining100%

Est. time3:00

Insp. PCO₂0.0 mbar

Peak temp12 °C

CO₂ absorbed0.99 L/m

Heat82 W

exhaustedtemperaturereaction front

CO₂ + H₂O → H₂CO₃① CO₂ dissolves in the pellet's surface water film

H₂CO₃ + 2NaOH → Na₂CO₃ + 2H₂O + heat② fast neutralisation by NaOH (catalyst)

Na₂CO₃ + Ca(OH)₂ → CaCO₃ + 2NaOH③ slow step: lime locks CO₂ as chalk, regenerating NaOH

Axial flow: exhaled gas and the premixed O₂ enter at the end cap (diver's right) and run the length of the bed to the head and its cells, so the violet front moves from right to left. ExtendAir at 40 m, 1.35 L/min CO₂: 130 min below 10 °C, 180 min at 10–20 °C, 220 min above 20 °C.